When I wanted to automate some of my tests and prevent myself from having to reach the power supply, I looked for a product which would allow me to switch off the power of the device remotely. I then found Cleware which provides some really useful USB-Switches.
Archive for the ‘USB’ Category
Controlling power supplies with USB
Wednesday, May 12th, 2010USB Composite Gadget Framework
Sunday, May 25th, 2008Hi all,
Let's take a look at the brand new, yet-to-be-merged USB Composite Gadget Framework.
The framework was introduced by Linux USB Developer David Brownell and, thanks to his great work, we're gonna be able to reuse what we now call usb function drivers into another entities, combining them to create a usb composite gadget.
Quoting Dave himself:
We want to split most of the current gadget drivers into reusable/combinable "usb_function" entities, making it easier to set up composite and multi-configuration gadgets.
Musb driver is going to mainline
Saturday, May 24th, 2008Hello all,
Finally musb/tusb driver is going to mainline 
We still have a few stuff to fix and I'm taking care of that but we're planning to push it to release 2.6.26 . From the day musb gets merged to mainline, the main development of it will be moved from linux-omap to linux-usb mailing list, which will allow more usb gurus to review the patches.
Most likely the driver will get more and more improvements.
Again,
Thanks to everybody that have been helping musb so far. Here's a git shortlog of those who have been helping us:
1 Alan Stern
2 Anand Gadiyar
2 Andrzej Zaborowski
4 Bryan Wu
51 David Brownell
5 Dirk Behme
28 Felipe Balbi
2 Hunyue Yau
7 Kevin Hilman
182 Tony Lindgren
3 Vikram Pandita
Please follow this thread in linux-usb mailing list for more details.
HNP: Host Negotiation Protocol
Thursday, November 8th, 2007We already discussed a bit about it and we know this is a feature to allow role switching in otg sessions without changing the cable. But what does this really mean? Who handle this? Which device(s) already support it? How should I know that my device supports HNP? Is there any public code for that?
That's what we're taking a look today. Take a look by clicking at the next link 
SRP Overview
Wednesday, November 7th, 2007Hello all,
What's SRP or Session Request Protocol? What is this for? How does this happen? How to implement it? How can I see it working?
These are the questions we're trying to answer in this post. Our first piece of code will come in this post. Like I said before, all codes are based on Linux OMAP git tree and MUSB driver.
OTG Overview
Wednesday, November 7th, 2007Hi all,
Let's start to take a look in USB OTG (On-the-go) functionalities. Of course, I'll focus on linux and MUSB driver which you can find in linux-omap git tree. In this first post, just a quick overview of the specs and its features.
Linux-OMAP + MUSB + OTG
Wednesday, September 26th, 2007Hello all,
After a long time in idle state, came out with a new and really nice feature that you can already see in linux-omap tree. Omap boards are using musb core to handle usb tasks in host, peripheral and otg modes.
What I've being doing since mid-February this year, is supporting USB OTG in tusb6010 usb controller. This controller is used in Nokia N800 devices and now, they can become Host in an otg session.
OTG stands for On-the-go, and that means we can switch roles between host and peripheral modes by using the correct usb cable. I'll try to setup a demo and make a video to show you all how the whole thing should work, but summarizing the whole feature, N800 can become a USB mass storage device and a USB Host Controller in an otg session.
In order for N800 to understand whenever it should be host or peripheral, we use and extra pin in usb connector called "id pin". When id pin is grounded, N800 switches to host role and it's floating, it stays in peripheral role (peripheral role is always the starting mode - b_idle).
For more details, everybody should look at OTG Supplement Revision 1.3, but that's mostly what happens.
Whenever I have more time, I'll setup a demo and post a video here
See y'all